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The Type 535 is a 10MHz* oscilloscope that accepts [[letter-series and 1-series plug-ins]]. | The Tektronix Type 535 is a 10MHz* oscilloscope that accepts [[letter-series and 1-series plug-ins]]. | ||
There are two timebases, and triggering is done with a Schmitt trigger made of a [[6U8]] tube (in | There are two timebases, and triggering is done with a Schmitt trigger made of a [[6U8]] tube (in | ||
early instruments) or a [[6DJ8]] tube (in late instruments). | early instruments) or a [[6DJ8]] tube (in late instruments). | ||
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has a [[thermal cutoff]]. | has a [[thermal cutoff]]. | ||
Type 535, the single-timebase Type [[531]], and the first four plug-ins, Types 53[[A]], 53[[B]], 53[[C]], and 53[[D]], | Type 535, the single-timebase Type [[531]], | ||
were [[introduced in 1954|introduced in August 1954]], advertised as '...the "convertibles" of the Tektronix line'. | and the first four plug-ins, Types 53[[A]], 53[[B]], 53[[C]], and 53[[D]], | ||
were [[introduced in 1954|introduced in August 1954]], | |||
advertised as '...the "convertibles" of the Tektronix line'. | |||
Types [[541]] and [[545]] [[introduced_in_1955|came out in March 1955]]. | Types [[541]] and [[545]] [[introduced_in_1955|came out in March 1955]]. | ||